; ModuleID = 'tc.ll' source_filename = "Main.cpp" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" %struct.c = type { double, double } @.str = private unnamed_addr constant [4 x i8] c"%f\0A\00", align 1 ; Function Attrs: norecurse uwtable mustprogress define dso_local i32 @​main() local_unnamed_addr #​0 { entry: %call = tail call noalias dereferenceable_or_null(12297664) i8* @​malloc(i64 12297664) #​3 %0 = bitcast i8* %call to %struct.c* %call1 = tail call noalias dereferenceable_or_null(12297664) i8* @​malloc(i64 12297664) #​3 br label %for.body for.body: ; preds = %for.body, %entry %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] %tr = trunc i64 %indvars.iv to i32 %conv = sitofp i32 %tr to double %a = getelementptr inbounds %struct.c, %struct.c* %0, i64 %indvars.iv, i32 0 store double %conv, double* %a, align 8 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 %exitcond.not = icmp eq i64 %indvars.iv.next, 768604 br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !llvm.loop !​2 for.cond.cleanup: ; preds = %for.body %arrayidx7.i.i = getelementptr inbounds i8, i8* %call, i64 10489184 %malloccall19.i = call noalias nonnull dereferenceable(16) dereferenceable_or_null(16) i8* @​malloc(i64 16) #​3, !noalias !​4 %_malloccache.i = bitcast i8* %malloccall19.i to %struct.c** %malloccall23.i = call noalias nonnull dereferenceable(16) dereferenceable_or_null(16) i8* @​malloc(i64 16) #​3, !noalias !​4 br label %for.body.i for.body.i: ; preds = %for.body.i, %for.cond.cleanup %iv.i = phi i64 [ 0, %for.cond.cleanup ], [ %iv.next.i, %for.body.i ] %1 = phi double [ 0.000000e+00, %for.cond.cleanup ], [ %add.i, %for.body.i ] %iv.next.i = add nuw nsw i64 %iv.i, 1 %2 = bitcast i8* %arrayidx7.i.i to %struct.c* %3 = getelementptr inbounds %struct.c*, %struct.c** %_malloccache.i, i64 %iv.i store %struct.c* %2, %struct.c** %3, align 8, !invariant.group !​7 %a10.i.i = getelementptr inbounds %struct.c, %struct.c* %2, i64 0, i32 0 %4 = load double, double* %a10.i.i, align 8, !invariant.group !​8 %sub.i.i = fsub double 1.000000e+00, %4 %div11.i.i = fdiv double 1.000000e+00, %sub.i.i %add.i = fadd double %1, %div11.i.i %exitcond.i.not = icmp eq i64 %iv.next.i, 2 br i1 %exitcond.i.not, label %diffe_Z1pP1cPd.exit, label %for.body.i, !llvm.loop !​9 diffe_Z1pP1cPd.exit: ; preds = %for.body.i %call4 = call i32 (i8*, ...) @​printf(i8* nonnull dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), double %add.i) ret i32 0 } ; Function Attrs: inaccessiblememonly nofree nounwind willreturn declare dso_local noalias noundef i8* @​malloc(i64 noundef) local_unnamed_addr #​1 ; Function Attrs: nofree nounwind declare dso_local noundef i32 @​printf(i8* nocapture noundef readonly, ...) local_unnamed_addr #​2 attributes #​0 = { norecurse uwtable mustprogress "frame-pointer"="none" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } attributes #​1 = { inaccessiblememonly nofree nounwind willreturn "frame-pointer"="none" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } attributes #​2 = { nofree nounwind "frame-pointer"="none" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } attributes #​3 = { nounwind } !llvm.module.flags = !{#0} !llvm.ident = !{#1} !​0 = !{i32 1, !"wchar_size", i32 4} !​1 = !{!"clang version 13.0.0 (git%github.com:llvm/llvm-project d163e75c81c1609855b98cbdffa0141c70d8578d)"} !​2 = distinct !{#2, !​3} !​3 = !{!"llvm.loop.mustprogress"} !​4 = !{#5} !​5 = distinct !{#5, !​6, !"diffe_Z1pP1cPd: %q"} !​6 = distinct !{#6, !"diffe_Z1pP1cPd"} !​7 = distinct !{} !​8 = distinct !{} !​9 = distinct !{#9, !​3} 

$ /mnt/sabrent/wmoses/llvm13/build/bin/opt tc.ll | /mnt/sabrent/wmoses/llvm13/build/bin/lli - -0.000003 

$ /mnt/sabrent/wmoses/llvm13/build/bin/opt -gvn tc.ll | /mnt/sabrent/wmoses/llvm13/build/bin/lli - 2.000000